(19)
(11) EP 1 017 173 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.07.2003 Bulletin 2003/31

(43) Date of publication A2:
05.07.2000 Bulletin 2000/27

(21) Application number: 99126089.4

(22) Date of filing: 28.12.1999
(51) International Patent Classification (IPC)7: H03K 17/082
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 28.12.1998 JP 37387798
20.05.1999 JP 14042199
20.12.1999 JP 36148399

(71) Applicant: YAZAKI CORPORATION
Minato-ku Tokyo 108 (JP)

(72) Inventors:
  • Ohshima, Shunzou, c/o Yazaki Parts Co., Ltd.
    Kosai-shi, Shizuoka (JP)
  • Watanabe, Mitsugu, c/o Yazaki Parts Co., Ltd.
    Kosai-shi, Shizuoka (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Power supply control device and method of controlling the same


(57) When the power supply from a power source 101 to a load 102 is controlled in a switching manner by a semiconductor switch QA, reference voltage generating means (QB, Rr) generates a reference voltage (VDSB) having a voltage characteristic substantially equivalent to that of a voltage between the terminals of the semiconductor switch QA being connected to a predetermined load. Detecting means CMP1 detects a difference between the voltage (VDSA) between the terminals of the semiconductor switch QA and the reference voltage (VDSB). Control means which consists of the gate driver 111 and CMP1 performs an on/off control of the semiconductor switch QA in accordance with the difference between the voltage (VDSA) between the terminals of the semiconductor switch and the reference voltage (VDSB).






Search report